CCP have just announced DUST514 will be exclusive to the Playstation 3. Which is a shame (check out the EVE Online forums for some stronger opinions). Unfortunately it makes sense for a few reasons (well making it exclusive to one console makes sense - whether the 360 or the PS3 was the better choice is more debatable).
Developing for a single console is quicker and easier - especially important for a game that will probably have more updates than the average game.
There are suggestions that one or both of Sony and Microsoft aren’t happy about cross-platform multiplayer games.
Since the idea of the game (a console FPS interacting with a PC MMO) is quite revolutionary they could get a lot of support (both financially and in terms of marketing and other benefits) from the console manufacturer, but only if it’s exclusive.
That being said, it may not be the end for the Xbox 360 and DUST. Sony have suffered recently and definitely have lower consumer confidence (will players have to give Sony any personal information to play DUST?) and this decision will have been made long before Sony’s hacking problems. If sales are lower than CCP hope they may rethink the plan. And remember, “exclusive” in the games industry can be a vague and rarely lasts for ever.
The game is scheduled for a Spring release so at least 360-only owners have a while to decided if they want to get a PS3 just for this game…